Paint Palette

The left mouse button paints, projected into every enabled channel at once and correctly across UV seams; each stroke lands on the active texture layer of the hit material. Shift+click draws a straight line from your last stroke. To remove paint, use the Eraser tool below (or a stylus's eraser end — see Pen Settings); the right mouse button is reserved for erasing the mask and panning the stencil.

The tool row

While the sidebar is in Painting mode, the icon toolbar beside the viewport grows a second group of icons — the paint tools. All but the last two are mutually exclusive tools; the last two are independent toggles that open their own panels without changing the tool you're holding.

• Paint Brush — the default: paints the enabled channels with the current color, brush image and dynamics.
• Alpha Drag — under the Paint Brush: press on the model, drag to size and turn one image, release to stamp it. The same tool is in Sculpt, and one stamp can paint and sculpt at once.
• Shapes — under Alpha Drag: drag to draw a line, rectangle, ellipse, star, polygon, triangle, arrow, cross or a polygon of your own; it stays live to move, size and turn until Enter paints it.
• Text — under Shapes: click for a line of text, drag for a box of it, or lay a path for it to follow; it stays live to retype, restyle, move, size and turn until Ctrl+Enter paints it.
• Eraser — paints with the current brush settings, but erases instead. Erasing on a real texture layer reveals what's beneath it; erasing the plain material image restores its neutral value. Locked layers refuse it.
• Blur Brush — softens what's already painted. Blur only works on the color/greyscale channels, so selecting it switches Color/Albedo on (and, by the exclusion rule, the Normal Map off) — the Normal Map section has its own separate Blur mode.
• Smudge Brush — drags color in the direction you drag, fading out toward the brush edge. Color/greyscale channels only.
• Clone Brush — stamps from a source point elsewhere on the surface, or from an image in the Image View or the Scratch Pad, across every channel.
• Mask (toggle) — opens the Mask panel.
• Stencil (toggle) — opens the Stencil panel and paints subsequent strokes through the selected stencil pattern.

Brush controls

Brush radius (0.05–100%, logarithmic), Falloff (0–1), Strength (0–1), Smoothing (0–1, a "lazy brush" that drags behind the cursor to filter out jitter), and Spacing (0.02–1, how far the brush must move before re-stamping). Shift+Wheel resizes the brush, Ctrl+Wheel adjusts falloff, Alt+Wheel adjusts strength — all three also have rebindable ]/[-family keyboard shortcuts that only fire while a paint window is open. Alt+click on the model samples color directly with the eyedropper instead of painting.

Color, greyscale channels & Normal Map

Color / Albedo paints a chosen RGBA color into the material's base color texture, with its own eyedropper. Four greyscale channels — Metallic, Roughness, Occlusion, and Height (bump) — are always offered regardless of whether the model has them yet, each painting a single 0–1 value. Enabling Normal Map disables Color and every greyscale channel at once, and offers four modes: Normalize (a plain color brush with no bump derivation), Additive (blends new bump detail onto what's already there), Normal (replaces the normal map under the brush outright), and Blur (softens the normal map in the brush's footprint). A Negative checkbox reverses whichever mode is active.

Height bump strength & Undo/Redo

Height bump strength (0–8) is a live shader overlay, not a texture write: it re-renders instantly with no repaint, and only gets baked into the actual normal map at export time. Undo and Redo (also Ctrl+Z / Ctrl+Shift+Z, hardcoded rather than rebindable) keep the last 32 strokes. Mask edits share the same stack — a Ctrl+Z steps back through paint strokes and mask changes alike, in the order they happened.